The investigators will assess the distribution pattern of the time to neutrophil recovery and compare groups using Student's t-test or the Mann-Whitney U test, as appropriate. The investigators will construct Kaplan-Meier curves for time to neutrophil recovery and compare treatment arms using a two-tailed log rank test. Dichotomous outcomes will be compared using a chi-square test. A sample of 96 patients with AML (48 in each group) was calculated to demonstrate equivalence allowing a 2-day difference between treatment arms (power of 90%, alpha 0.05).